Thomas baxter



MPETERS. PHOTO-LITHOGRAPHER, WASHINGTON. D. C.

IED STATES PATENT OFFICE.

THOMAS BAXTER, OF PETERSBURG, VIRGINIA, ASSIGNOR TO YIM. H. BAXTER, OFSAME PLACE.

HYDRAULIC PRESS.

Specification of Letters Patent No. 23,741, dated April 19, 18,59.

To all whom t may concern:

Be it known that I, THOMAS BAXTER, of the. city of Petersburg and Stateof Virginia, have invented a new and Improved Mode of Constructing theCylinders of Hydraulic Presses; and I do hereby declare that thefollowing is a full and exact description thereof, reference being hadto the accompanying drawings and the letters of reference markedthereon.

The nature of my invention consists in casting the barrel of thecylinder separate from the head thereby allowing the thickness to bemuch less in consequence of all longitudinal strain being overcome andat the same time the quality of the casting is improved being moredense. Wrought iron bands are shrunk on the casting to increase itsstrength. It is not necessary that the bands should be in contact witheach other. The cylinder A is cast with a flange B or ears at one endthrough which the bolts or dowels C pass by which it is confined in itsposition on the lower head of a press D. The cylinder is bored smoothlyof the same size throughout its whole length except about one inch ofthe upper end which is slightly enlarged to facilitate the entrance ofthe ram after the packing has been affixed thereto. The lower end of thecylinder is turned smoothly and at right angles to its axis. The surfaceof the lower head of the press is as true a plane as possible where thecylinder is to be placed.

To put the cylinder together it is only necessary to place the barrel onthe head and bolt it in position by bolts passing through the flange orears into tapped holes prepared in the head then the packing E composedof leather india rubber or other suitable material which covers thebottom of the cylinder and turns up against the inner surface of the.barrel and an iron plate of thickness proportioned to the size ofcylinder is placed in its position and fastened by a screw-bolt throughits center. The ram is packed in the same manner. llVhen the rain is putinto the cylinder it is prevented from descending too far and injuringthe packing by the heads of the bolts F. The water from the force pumpsis introduced into the space between the packings.

W'hat I claim as my invention and desire to secure by Letters Patent is-The making the cylinders of hydraulic presses in a manner substantiallyas described.

DANIEL I-IALsEY, HENRY I. LYNCH.

